Canon Patent: 24-130mm F4 IS and 24-80mm F2.8 IS

Here is a new Canon patent application for two zoom lenses.

Canon patent application 2024160458 (Japan, published 11/14/2024) discusses optical formulas for two zoom lenses:

• 24-130mm F4 IS
• 24-80mm F2.8 IS

From the patent literature:

• To obtain a compact zoom lens having a bright F-number, a high zoom ratio, and high optical performance.
• Background Art: Zoom lenses used in imaging devices such as those described above are required to have high performance with minimal aberrations and high resolution up to high spatial frequencies. In such zoom lenses, the degradation of optical characteristics due to diffraction cannot be ignored. Since the degradation of imaging performance due to diffraction is determined by the F-number of the zoom lens, zoom lenses are required to have a bright open F-number (large aperture ratio). Also, in order to reduce noise when imaging in dark places, a bright F-number is required throughout the entire zoom range. Furthermore, zoom lenses are required to be compact and to have a high zoom ratio.

Example 1

• Focal length: 24.72-130.99
• F-number: 4.08-4.12
• Half angle of view: 37.84-9.38
• Image height: 19.20-21.64
• Total length: 127.91-182.91
• Back focus: 11.19-47.32

Example 2

• Focal length: 24.72-82.44
• F-number: 2.88-2.91
• Half angle of view: 37.91-14.71
• Image height: 19.25-21.64
• Total length: 141.91-178.40
• Back focus: 12.29-33.22

More Canon patents are listed here.

[via asobinet]